4-1-5. No Video (Tuner DTV)
Symptom Audio is normal but no picture is displayed on the screen. -
Major
checkpoints
Check the DTV source. -
Check the Tuner, Check the Valencia. -
Refer to the next page to check the lacation such a CN201 or IC201 SVC Manual mentioned. -
Diagnostics
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Yes
Yes
Yes
No
Check a set in the ‘Stand-by mode’.
Check the LVDS cable?
Replace the T-con / LCD panel?
No
Please, Contact Tech support.
Input the RF source properly.
Check the connection of RF cable ?
No
Check the D-TV source.
Change the Main Assy.
No
No
Check the ‘signal strength’ in Self Diagnosis
menu Strength is enough ?
Check the Power of Tuner ?
Pin #5 of Tuner : B33V_Tuner
Pin #3 of Tuner : B5V_Tuner
Yes
Check IC901.
Change the Main Assy.
No
Check the CH output of IC901 ?
R905 : CH_CLK
RR906 : CH_VALID
6
Yes
Check IC1101 and IC1701.
Change the Main Assy.
No
Check the LVDS clk signal at output of
Main board ? (TX1~TX4)
TP1916 ~1919
TP1940 ~1942
5
Caution Make sure to disconnect the power before working on the IP board.
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